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Sea ice effective microwave emissivities from satellite passive microwave and infrared observationsNear-simultaneous images from the temperature-humidity IR radiometer and dual-polarization scanning multichannel microwave radiometer of the Nimbus 7 satellite are used to investigate microwave sea ice emissivities on a global scale. Emissivities in several Arctic region study areas are found to be approximately constant during a nine-month pereiod covering the fall, winter and spring months, in the cases of both first-year and multiyear ice. During the onset of summer, emissivity increases of about 30 percent are observed at 37 GHz in multiyear ice. A multichannel cluster analysis over very large study areas during winter indicates considerable variability in emissivities of consolidated ice clusters at 37 GHz, and only 1/3 as much variability at 18 GHz. If the variability within each cluster is quantified and taken into account by means of multispectral analysis, data on ice thickness and surface characteristics may also be obtained.
Document ID
19830065696
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Comiso, J. C.
(NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
September 20, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
83A46914
Distribution Limits
Public
Copyright
Other

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